I'm sorry mash but this was just to good an idea to pass up. A slightly reversed and more loving version of Mash maliciously melts master. I wanted to try focusing less on the vore itself but more on the digestion and post vore.

Mash finds out that her master has a special craving and is all to happy to help sate it

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Mash fidgeted on a plain white bed, her body almost nude aside from a few pieces of purple fur, translucent purple gloves that reached her just over her elbows and leggings, a pair of fluffy purple ears and lastly, a decorative purple tail. Aside from those, everything from her thighs to her shoulders was naked. Save for a pair of small purple furs covering her nipples and a few strands of rope-like fabric to keep the outfit on. The outfit matched her pale skin perfectly, her dark purple hair and eyes even more so.
"You look adorable Mash." Gudako smiled, running her cold hands over her kohai sending shivers down Mash's body. Gudako's hands came to rest on the shielder's large breasts from behind, sinking into the soft flesh.
"And how is it these look so much bigger when you wear this? They certainly aren't padded." Gudako teased as she squeezed the soft mounds, a sharp gasp escaping Mash.
"I...I....I...d....don't know," Mash stumbled over her words as the woman she had a crush on for over a year groped her. The feeling was heaven for the quivering demi-servant.
"Well, they're lovely. I wish I could just play with them for hours." Gudako's voice sent waves through Mash.
"Feel free to enjoy them as much as you want Senpai." Mash whimpered out with a shaking smile, "But did you ask me to wear this just so you could grope me? Not that I mind!" Mash turned an adorable shade of red, much to her master's amusement.
"No, there was another reason. I had a sudden eggplant craving." Gudako brushed some of her red hair away from her gleaming golden eyes, her smooth golden skin was captivating to Mash and many others, it gave the illusion that the woman was a living treasure among normal people. It wasn't hard to believe that all the heroic spirits from mythology and history all adored her. Mash had seen firsthand how Gudako could turn even a straight woman gay many times.
"An eggplant craving?" Mash asked.
"Yep, there are a few purple haired servants, but you're the only real eggplant in Chaldea and the one I was craving." Gudako teased, her silky lips kissed against Mash's refined skin, Mash almost leapt out of her skin at the affection.

"I don't get it, Senpai."
"Let me show you then." Gudako took Mash's delicate gloved hands in hers, she tugged the long glove off, the fur tickling Mash's skin as it slid across her. Gudako fondled the gloves for a moment before placing them on her nightstand. Mash could feel her Master's breasts pressing against her back as her arms were gently pulled over her shoulders. Gudako kissed the soft hands.
"I'll miss these," Gudako whispered to herself. She pulled the dainty hands to her mouth, it widened to accept them. Mash gulped as dampness enveloped her hands, she could feel Gudako's tongue licking across her skin.
"Senpai, is this some kind of new play?" Mash tried to turn to look at her master, but her arms stopped her from seeing what was happening. Behind her, Gudako savoured the sweet taste of her kohai, licking across every inch of Mash's hands before pulling them down her throat. More of Mash's long slim arms passed into Gudako's maw. Gudako gulped greedily, Mash fell onto her back at the sudden jolt, the new angel gave her a perfect view of what was happening. She starred in awe at what she saw, her arms lipping down the gullet of the woman she adored, Gudako's silky lips almost kissing over the shielder's arms as they became food. It should have horrified Mash, Yet it didn't. If anything, it was beautiful to her.

"Senpai? You're eating me?" she rasped, still shocked by the act. Gudako replyed by placing a tender hand on Mash's head, tenderly stroking her.
"I hope I taste good. Be careful not to choke on me, okay." Mash smiled as her master began to envelop the crown of her head. She watched as Gudako's lips passed over her eyes, the white room and beautiful woman being replaced by pink flesh and white teeth. Gudako's tongue flicked across the back of her head tickling the girl. Mash giggled as more of her was ingested, Gudako sped up as she devoured more of Mash. Mash made sure not to move lest she accidentally hurt her master, she knew she wasn't in danger, so she could just relax and let her master eat her, let her lick across her exposed body.
Gudako wasted no time greedily slurping up her cute kohai, speeding past Mash's shoulders, stopping only for a few moments at her large breasts, even passing her slightly pudgy belly in what felt like only seconds. The warm stomach greeted Mash as her head sank into the humid pit she curled up within it happily. The experience of becoming food was anything but scary, the feeling of the coarse tongue dragging across her skin was heavenly, knowing how much her master wanted her was euphoric, she only whished Gudako would slow down and savour her.
"I'm glad you're enjoying me senpai. I'm enjoying this as well." Mash beamed, even though Gudako couldn't see it she could feel the warmth emanating from her delicious kohai. Gudako sped across Mash's supple body, every new swallow made her want to devour Mash more than the last. Mash ran a hand across the pulsing stomach that surrounded her, she could feel her thighs dragging against the rough tongue, Gudako's teeth scraping against her as she slid deeper down the waiting gullet. Soon all that remained of her outside her crush were her feet. Only now did she make any movement outside the gut, playfully wiggling her feet.
"I never imagined this could happen, or how good it would feel to be eaten. I'm glad Senpai thought of this." Mash giggled, "I wonder if I'm the only one she's done this with? If I am, then this is belly is all mine to enjoy." Gudako starred at the squirming feet. With a mournful sigh, she reached up to give them a teasing tickle before slurping them down as well. Mash had officially been devoured whole. Gudako ran her hands across her bloated belly, feeling every distinct shape of Mash's body now trapped in her stomach with a sad smile.
"That was amazing, Senpai. How long are you going to keep me here?" Mash cooed, her face pressing against Gudako's hand lovingly.
"Sorry Mash, but I'm going to digest you," Gudako replied.

"Feel free to hate me for it. I understand. But I'm afraid I just couldn't resist eating you up, and now you're food, and food gets digested." Gudako rubbed across her meal's face with a twisted smile. "Don't worry though, Mash, I'll never forget you."
Mash was silent as she tried to come to wraps with the fact her beloved senpai was saying she was going to digest her. That she was going to kill her. Yet her voice was still so sweet, so lovely. Mash laid her head back against the warm rippling belly.
"Okay, Senpai. I hope I don't make you fat. Be sure to go to the gym and work me off, humans are fatty after all." she finally replied, nesting her cheek against Gudako's fingers through the pulsing gut. The mage's jaw dropped, she knew Mash would do almost anything for her, but this? She was willing to let herself be digested by Gudako? She could feel Mash nuzzling against her hand tenderly.
"Really, Mash? You're not going to fight or tell me I'm evil or anything?"
"No, I don't mind. I love you Senpai, so digesting inside you doesn't seem that bad. I get to be with you forever. So I'm happy to become part of you." Mash cooed lovingly.
"I love you to Mash. I hope you enjoy this as much as I do." Gudako ran her finger's over Mash's outline.
"I can already feel your gastric acids on my skin, it feels wonderful Senpai. I'm sure it will only get better as I melt." Mash rasped happily.
"Maybe I should call you Mush instead,"
"Yes! Mush Kyrielight, reporting for duty as food. Please digest me, Master!" Mash cried excitedly, her face rubbing even more against the tight gut. Gudako couldn't help but burst into a fit of mad laughter at hearing Mash call herself Mush.
"You're really having fun in there. I hope it stays out like that, I'd hate to hear that it's painful or feels like you're burning alive." Gudako massaged across the shielder. The stomach began to fill with acid, the simple tickle that had greeted Mash when she arrived was now replaced by the acid splashing over her body. She could feel her skin softening, a few patches of hair were already floating and dissolving in the hot juices. The gut contracted with every breath Gudako took, squeezing gently against her, she knew that as the process went on these contractions would crush her body to bits. Her skimpy dangerous beast costume was almost reduced to tatters, what was left of the purple stalkings was a melted orange with splashes of green.
"Mash, how are you holding up?"
"I'm not melting much. I thought I would have started digesting by now." Mash whined.
"That's a bad thing?"
"YES! I expected to be digesting now, my defense must be too high."
"Well, maybe I can help, try kneading you. Help you melt." Gudako began to rub her palms into Mash's body. The demi-servant yelped in surprise as she felt chunks of skin tear off. She cried in joy at the feeling of her body crumbling.
"Yes, do that, Senpai. Keep doing that, I want to melt inside you, please digest me!" Mash cried in pure bliss.
"Alright, guess I have to give you a hand." Gudako shook his stomach side to side, Mash cried in surprise as her world shook and bounced. She crashed against the stomach wall, she watched as her right foot splattered into slush painlessly.
"My foot. It's gone." Mash cried excitedly as her body tumbled deeper into the gurgling liquid, her arm bumped against the opposite side with a squelching sound. With her body shaken, softened and missing a hand and leg, digestion began to speed up. Her hair quickly dissolved off her head, her skin was pulling off her with every contraction of the hot belly. Her vision was starting to blur as the acid splashed against it, burning it out, it was the only pain she was feeling from her body melting.
"I think you're starting to melt. Maybe I should start calling you Mush now." Gudako teased. Mash replied with a happy cry, her melting face pressed against the stomach wall, the mage was able to admire every detail of the dissolving girl. Gudako teasingly pushed her fingers into Mash's gaping mouth through the layer of flesh, much to the shielder's joy.
"Yes, Senpai, please do. Make me your food. I want to digest. This is amazing." Mash bellowed with joy.
"My god, you're into it. You said you were okay with it, but I never expected this. I don't think I've ever seen you this excited about anything before." Gudako playfully smacked Mash's back, she yelped as she heard bones crack, flesh splattering against the slap. Mash squirmed in delight as more of her disintegrated into Mash soup. Mash felt the tight confines slam into her so tightly she could barely breathe.
"D...do you...feel that Mush?" Gudako rasped with haggardness.
"Yes, I do." Mash whimpered weakly, her head spinning as she tried to speak.
"That's me masturbating. To you. It feels amazing to digest you. I want you to know how much I'm enjoying this." Gudako teased as she fingered herself, each thrust into her body sent the gut crashing into the meal.
"You're masturbating to me? I'm glad to hear that. It's an honour to be your food and toy Master. Do you mind if I try to masturbate?" Mash groaned blissfully.
"Of course, Mush. Go ahead. But I bet this isn't the first time you've masturbated to me." Gudako chuckled.
"Of course not, Senpai. Before I met you, I'd never felt anything like this, but ever since, I couldn't control myself. I don't know how many times I've masturbated to you. How many times I've had to resist trying to do lewd things to you. Wanting you to do lewd things to me." Mash trembled as she gasped for breath.
"Oh? What kind of lewd things?"
"Things like hand-holding, or kissing."
"Oh, Mash, so wholesome and pure." Gudako chuckled.
"OR FUCKING ME FOR HOURS!!!" Mash cried happily.
"Less wholesome." Gudako was shocked to hear that from her kohai. She could already hear the gasping cries of Mash trying to get off one final time before digesting. The shuddering gut slammed against Mash's body, each time tore flesh from her melting body. She sunk deeper into the gurgling acid with a blissful smile, not stopping for a moment from her rampant masturbation. Her legs were nothing but slurry, her sensitive breasts melted from her body in a wonderful mix of stimulation, holes melted through her body through to the other side, her face dissolved to half.
"Senpai, I think I'm almost gone. I don't think I'll last much longer." Mash struggled to speak, her melted throat barely mustering a weak rasp.
Gudako gasped sharply as the tight walls suddenly released Mash's body. The moment the walls parted from her Mash's body fell to slurry, nothing from below her once bountiful chest remained. She let out a thunderous scream of pleasure as she came before dissolving away.
"Senpai. I love you. I'm so glad you ate me." she murmured weakly, her eyes fluttering shut for the final time.
"And I love you, Mush. You are all mine, forever. And I'll never let you go. You'll be with me forever." Gudako cooed, her hand rubbing across the gurgling stomach with a smile. "And I know you'll look lovely on me."

Mash woke to a strange sensation, she felt the world bouncing gently around her, a tight confine keeping her snug, wrapped in something warm and soft.
"Where am I?" she mumbled to herself. The darkness around her began to clear, she found a white room greeting her.
"I'm in Senpai's room? I thought I got eaten, I was digested." Mash mumbled to herself slightly disappointed.
"Are you awake now, Mush? I can feel you in there. How do you like being part of my boobs?" Gudako's voice teased lovingly. Mash squeed as she felt someone squeezing her entire body in their soft hands.
"There's no point trying to reply to me while I'm awake. Sadly I can't hear you right now, but once I'm asleep, I'm all yours. Though I can feel your emotions." Gudako rubbed Mash's new body, the soft mounds bouncing in the mage's hands. Mash felt herself drift down from the heavenly orbs, she found herself in her beloved Gudako's stomach.
"Oh, moving to my tummy, that's right Mush, you filled it out a lot. I'll have to try to exercise to get it under control." Gudako tittered, "You're mine Mash, body, mind and soul. All mine, forever. If you want to hate me for this, I understand."
"I could never hate you Senpai. I'm happy to be part of you. Now I can help you in a different way."
"Oh? I guess you like your new home. I can't hear you, but I can feel you, your love. I'm glad you're happy to be here. I'll try working on this so we can talk easier during the day. Maybe I can even summon you as a familiar. Oh, plus from eating you, I got all your powers so I can be more help in combat myself." Gudako massaged her buttery potbelly belly
"Senpai, I better see you in my armour! I'm not missing such an amazing sight." Mash tried to yell at the mage, but she knew her words would go unheard.
"Oh? You're mad about something? What, do you not like the idea of me using your power for a fight? Or maybe, you just want to see me in that slightly lewd armour of yours?" the stomach gurgled in response to her question. "I'm betting it's the latter."
"Do you want to see what you did to me, Mash? Or do you like being called Mush now?"
"Yes, Senpai! Let me see what I added to your beautiful body." the living fat that Mash had become squeed excitedly.
"Alright," Gudako got up, allowing Mash to see the room from a much shorter height than she was used to. The mage came to a stop at a mirror, Mash almost screamed in excitement at the sight before her. It was the woman she loved stark naked save for a pair of tiny white panties. Her small breasts now bounced freely at double their original size, if not more. Her once flat toned stomach now sported a noticeable potbelly that jiggled as she moved. Her ass was also larger though compared to the other two, it looked the closest to how it had been before, only marginally bigger but still enough to make the digested soul drool. Her thighs had gotten plumper as well, the once almost spindly legs now had a bounce to them that made Mash's heart flutter.
"You look amazing, Senpai. I can't believe I added so much to you."
"And what you see is just the physical. Your magic circuits, mine. Your plentiful mana, mine. Your demi-servant powers, mine. and of course, you yourself. MINE." Gudaka grinned, her fingers tickling across her bulbous belly to tease its occupant.
"Maybe I should wear that bikini mystic code so I can show you off?" Gudako snickered, "You're going a bit gaga. If you're going to be like this every time I get dressed, it's going to make getting dressed a nightmare. Unless you just want me to go around naked?"
Mash cried with joy at the prospect.
"This is going to be fun." Gudako chuckled to herself as Mash's soul drifted back to sleep, overloaded by the events of the day.